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Finding the Fourth Proportional to 81,757.74, 112,721.58 and 54,857.64

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Solution

The fourth proportional to 81,757.74, 112,721.58 and 54,857.64 is: 75,633.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,757.74 : 112,721.58 = 54,857.64 : x
  2. Step 2: Convert to fraction form
    81,757.74/112,721.58 = 54,857.64/x
  3. Step 3: Cross multiply
    81,757.74x = 112,721.58 × 54,857.64
  4. Step 4: Simplify right side
    81,757.74x = 6,183,639,855.87
  5. Step 5: Solve for x
    x = 6,183,639,855.87/81,757.74
  6. Step 6: Final answer
    x = 75,633.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.